I bought crankshaft bearings from Section8superbike and was happy with the cost. Sometimes, for critical parts like engine bearings, it doesn't pay to be cheap.
The MSRP for the bearings according to my local dealer was more than the MSRP than I was quoted from Section8, and they have a 10% off Ducati parts deal, so I saved some dough. Section8 has been very good to me, and I've spent almost a couple grand there lately. Top notch service, to say the least.